Migrate from Exchange 2003 to Exchange 2010... then switch off Exchange 2003

Current setup. Server 2003 and Exchange 2003 in a 2003 domain supported by 2008 r2 DC and original 2003 server with exchange 2003.

I have added 2008 r2 DC so I can migrate away from 2003 domain.

All DC's off apart from last original DC with Exchange 2003.

Migrated roles away etc..

Added an Exchange 2010 server to the organisation and created mailboxes etc... and all is working at the mailboxes on the exchange 2010 can send and receive etc...

I did this in an Exchange 2003 and Exchange 2010 coexisting type scenario.

I did this some months ago and now ready to move off the original exchange 2003.

I need to migrate accounts from exchange 2003 to exchange 2010... no big deal.. im happy with that.

Then I need to decommission original Exchange 2003 and then Server 2003 DC..

Apart from uninstalling Exchange 2003, what else must I do?

Do I need to tell Exchange 2010 that it is now sending and receiving as the Exchange server for the organisation, or simply using the Exchange Add/Remove option is enough and will update the Exchagne 2010 so it will simply get on with the job and I can point my routers 25 port traffic to Exchange 2010 server instead of Exchange 2003 server.

On Exchange 2010, you need to have anonymous enabled on the receive connector. Then you can have inbound email being delivered to Exchange 2010. Exchange will sort out where it needs to go.
For outbound

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